.triangle(@_,@wwww,@ccccc){
    width: 0px;
    height: 0px;
    overflow: hidden; 
}

.triangle(L,@w,@c){
    border-width: @w;
    border-style:dashed solid dashed dashed;
    border-color:transparent @c transparent transparent ;
}

.triangle(R,@w,@c){
    border-width: @w;
    border-style:dashed  dashed dashed solid;
    border-color:transparent  transparent transparent @c;
}

.triangle(T,@w,@c){
    border-width: @w;
    border-style:dashed  dashed  solid dashed;
    border-color:transparent  transparent @c transparent ;
}

.triangle(B,@w,@c){
    border-width: @w;
    border-style:solid dashed  dashed dashed;
    border-color:@c transparent  transparent transparent ;
}